94
RATIONAL CONSTRUCTION OF FURNACES
From time to time vertical regenerators are designed without
regard to the fundamental principles that a current of hot gases
in cooling should pass downward, and a current of air or gas which
FIG. 51.
is being heated should pass upward. Figs. 52 and 53 show such
construction.
In each of these cases the current of gases changes its direction
of flow from upward to downward, or vice versa. Thus in Fig. 52
the gases which are giving off heat enter at the top and flow to the
.... LM^ID—L, ',.,,. L,,, 1__'^...Iv.'
/•///^w^^^v^
FIG. 52.
FIG. 53.
bottom of the checkerwork (in the correct manner) and then turn
and flow from the bottom to the top of the second chamber (in an
incorrect manner); in Fig. 53 the gases which are giving off heat
enter at the bottom and rise to the top (in the incorrect way),
then they flow downward (in the correct manner).